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What Material Was Used to Make the Olmec Colossal Heads

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What material was used to make the Olmec colossal heads?


Definitions:

Factorial Research

A methodological approach in experiments that involves studying the effects of two or more factors.

Single-Factor Research

A study design where the effects of one independent variable on a dependent variable are examined.

Independent Variables

Variables in an experiment or model that are manipulated or categorized to determine their effect on dependent variables.

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